Lydfors



J. LYDFORS 3,032,261 CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPL A CUT MULTIPLYING Filed Nov. 28, 1955 May 1, 1962 YING, ESPECI LLY SHORT l6 Sheets-Sheet l BEJEIEIEJ J. LYDFORS May 1, 1962 CALCULATING MACHINE CONDITIONABLE FOR AUTOMAT MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING Filed NOV. 28, 1955 16 Sheets-Sheet 2 May 1, 1962 J. LYDFORS 3,032,261

CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING 16 Sheets-Sheet 3 Filed Nov. 28, 1955 May 1, 1962 DFORS 3,032,261

J. LY CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING Filed Nov. 28, 1955 16 Sheets-Sheet 4 i Hg. 8.

iiiii! u J. LYDFORS NE May- 1, 1962 CALCULATING MACHI CONDITIONABLE FOR AUTOMAT MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING Filed Nov. 28, 1955 16 Sheets-Sheet 5 ATIC TIPLYING l6 Sheets-Sheet 6 May 1, 1962 J. LYDFORS 3,032,261 CALCULATING MACHINE CONDITIONABLE FOR AUTOM MULTIPLYING, ESPECIALLY SHORT-CUT MUL Filed Nov. 28, 1955 J. LYDFORS 3,032,261 NE CONDITIONABLE FOR AUTOMATIC ESPECIALLY SHORT-CUT MULTIPLYING May 1, 1962 CALCULATING MACHI MULTIPLYING 16 Sheets-Sheet 7 Filed Nov. 28, 1955 May 1, 1962 J. LYDFORS 3, CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING l6 Sheets-Sheet 8 Filed Nov. 28, 1955 1962 J. LYDFORS 3,032,261

CALCULATING MACHINE CONDITIONABLE. FOR AUTOMATIC ESPECIALLY SHORT-CUT MULTIPLYING MULTIPLYING 1955 l6 Sheets-Sheet 9 Filed Nov. 28,

y 1, 96 J. LYDFORS 3,032,261

CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING Filed Nov. 28, 1955 I 16 Sheets-Sheet 10 hos y 1962 J. LYDFORS 3,032,261

CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING l6 Sheets-Sheet 11 Filed NOV. 28, 1955 y 1, 1962 J. LYDFORS 3,032,261

CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING 1955 16 Sheets-Sheet 12 Filed Nov. 28,

May 1, 1962 J. LYDFORS 3,032,261

CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING Filed Nov. 28, 1955 16 Sheets-Sheet 15 May 1, 1962 J. LYDFORS 3,032,261 CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING l6 Sheets-Sheet 14 Filed Nov. 28, 1955 May 1, 1962 J. LYDFORS CALCULATING MACHINE MULTIPLYING Filed Nov. 28, 1955 3,032,261 CONDITIONABLE FOR AUTOMATI ESPECIALLY SHORT-CUT MULTIPLYING 16 Sheets-Sheet 15 May 1, 1962 J. LYDFORS 3,032,261

CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPECIALLY SHORT-CUT MULTIPLYING Filed Nov. 28, 1955 16 Sheets-Sheet 16 ig- L20 ezzrwz 7. Lydfoz'a United States Patent i 3,032,261 CALCULATING MACHINE CONDITIONABLE FOR AUTOMATIC MULTIPLYING, ESPE- CIALLY SHORT-CUT MULTIPLYING John Lydtors, Kopenhamnsvagen 11A, Malrno, Sweden Filed Nov. 28, 1955, Ser. No. 549,473 Claims priority, application Sweden Dec. 3, 1954 Claims. (Cl. 235-60) This invention relates to a calculating machine that may be conditioned for automatic multiplying and particularly a machine for short cut multiplication.

One of the objects of my invention is to provide an improved multiplying device capable of being combined with a calculating machine of conventional design, and also those machines which are provided with a printing device.

:Further objects of the invention will appear from the description and claims.

In the drawings in which and embodiment of my invention is shown:

FIGURE 1 is a plan view of the machine;

FIGURE 2 is an enlarged plan view of the key board mechanism of the multiplying device;

FIGURE 3 is a partial vertical section taken on the line 33 of FIGURE 2, showing the key for the digit 1;

FIGURE 4 is a partial vertical section taken on the line 4-4 of FIGURE 2, showing the key for the digit 7;

FIGURE 5 is a side View of transmission elements for registering the character of the digits introduced;

FIGURE 6 is the appertaining plan view;

FIGURE 7 is a side view of a registering mechanism;

FIGURE 8 is the appertaining plan view;

FIGURES 9 and 10 show in side view and plan view, respectively, a bow device associated with the registering mechanism;

FIGURE 11 shows a mechanism for the selection of positive and negative feeding;

FIGURE 12 is the appertaining plan view;

FIGURE 13 shows in side view parts of a mechanism for starting and stopping the machine;

FIGURE 14 shows the same mechanism in plan view;

FIGURE 15 shows in side view additional parts of the last-mentioned mechanism;

FIGURE 16 is the appertaining plan view;

FIGURE 17 shows in side view members for the selection of positive or negative feeding;

FIGURE 18 is the appertaining plan view;

FIGURE 19 is a side view of members for obtaining an additional entry impulse;

FIGURE 20 is the appertaining plan view;

FIGURE 21 shows in side view an axle clutch;

FIGURE 22 is a plan view of the same member;

FIGURE 23 is a side view of the driving arm system of the machine;

FIGURE 24 shows in side view a controlling arm system;

FIGURE 25 is a plan view of the driving lever system and the controlling arm system;

FIGURE 26 shows in side view a detail cooperating with the mechanism illustrated in FIGURE 17;

FIGURE 27 is the appertaining plan View;

FIGURES 28 and 29 show a side elevation of the complete multiplication unit and FIGURES 30 and 31 show top plan views of the arrangement as shown in FIGURES 28 and 29, respectively.

The calculating machine may be fitted with any described actuator, such as a pin wheel drum (Odhner wheel drum) or a setting carriage, and be provided with a normal key board for addition, such as a ten-key keyboard or a full key board.

According to a selected embodiment, the multiplying 3,032,261 Patented May 1, 1962 device according to the invention is built as a unit which is mounted at one side of the calculating machine and fitted with an individual key board for introducing the multiplier. The adding machine may be a machine provided with a totalizer, and means to enter amounts into the totalizer, as shown for example in US. Patent No. 2,397,745 issued April 2, 1946 to Karl B. W. Kiel.

The accompanying drawings illustrate an example of a machine according to the invention, in which example the main driving shaft of the multiplication device is arranged to carry out an oscillating rotary motion. However, the invention is not limited to such an oscillating motion. The main driving shaft may, within the scope of the invention, be always rotated in the same direction, and guiding curves or eccentrics being operative in cases where a stroke movement or an oscillating movement is desirable.

In FIGURE 1 is shown a printing calculating machine 1 of conventional type associated with the multiplying device 2 according to the invention. The machine 1 may be an adding and subtracting machine provided with a bank 3 of depressible amount keys, an actuator or setting device and a totalizer (not shown), window openings 4 and 5 for reading off the amounts of the actuator and of the totalizer, printing members 6 for printing the result of the calculating operation and a printing device 7 for printing the multiplier.

The multiplying device 2 is mounted along the right side of the adding machine and is provided with a key 8 adapted to start the printing control mechanism and a key board comprising ten multiplication keys 10. The keys are arranged in two columns located side by side, with one column containing the keys for the digits 0, 2, 4, 6, 8 and the other column the digits 1, 3," 5, 7!, 9-

The multiplication keys are each provided with a stem guided for movement in the vertical direction. According to example shown, the key 10 for the digit 1 is shown in a side view in FIGURE 3. The stem 11 of the key, guided in known manner in the lateral direction, is formed with two guide slots 12 and 13 parallel to each other, which are adjustable on fixed horizontal rods 14 and 15, respectively. In this way, the stem 11 may be adjusted in its axial direction downwards against the action of a spring 16. The stem 11 is provided with a pin 17 engaged with a slot 18 in a lever 19, which lastmentioned component is swingable in the vertical plane on a horizontal axle 20. The slot 18 extends in the longitudinal direction of the lever 19 so that the pin 17 travels, during the depression of the key 10, along the slot 18.

The lever 19 is integral with a multi-slotted guide plate 21 formed with the three different guide slots 22, 23 and 24. Said guide slots, each of which is arranged to cooperate with a corresponding movable member and which are adapted, upon the depression of the key, to displace or fix the position of said movable member, and each has a separate task. Thus, the guide slot 22 has for its purpose to indicate the digital value representing the properties of a group digits. The digit series is divided into two groups, with a first group containing the digits 0 to 5 and a second group containing the digits 6 to 9. In the shown example, in which the guide plate 21 is adjustable by means of the key for the digit 1," the guide slot 22 is designed for entry of said digit as a positive one. The movable member controlled by the guide slot 22 consists of a horizontal rod 25 forming part of a swingable bow mounted in the frame of the machine. The rod 25, which is common to all of the slotted disks, is located as shown in FIGURE 3 in the position corresponding to the digit 0. However, it may be displaced in steps, to the left according to the figure, into five different positions corresponding to the digits 1 to 5. The center lines for the zero position as well as for the five other positions are marked by dashes. The lower part of the guide slot 22 is formed with a width corresponding to the diameter of the rod 25 and follows an arc line concentric with the mounting 3X16 26 of the lever 19 and is located a radial distance from said axle corresponding to the value represented by the appertaining figure key, i.e. in the present case the digit 1. The upper part of the guide slot 22 has such a width that the rod 25 may be moved by anyone of the guiding disks into its representative positions. Thus, the rod is shown in FIGURE 3 in an initial position, the zero position, from which upon the depression of the key 10, it is displaced one step to the left when the lower part of the guide slot passes into engagement with the rod. The value-determining part of the edges of the guide slot 22 consists of an arc shaped portion 26 which at the top is joined to an edge portion 27 at a greater radial distance than the edge portion 26. Thus, the edge portion 26 of the different guide slots lies at different radial distances from the axle 2d of the slotted plates, the shortest radial distance thus corresponding to the digit 5. At its end portions, the rod 25 is rigidly connected to two arms swingably mounted on a horizontal axle 29, and one arm 3t) (FIGURE of which transunits the guided motion of the rod 25.

The second guide slot 23 (FIGURE 3') has for its purpose to select the sign for the operation, i.e. to indicate positive or negative feeding. The upper portion of the guide slot 23 encloses a rod 31, which is displaceable parallel to a position 32, marked by dot and dash lines, to the right of the initial position shown. When the rod is in the initial position, the machine is occupied with positive feeding, whereas upon the displacement of the rod 31 into the position 32 negative feeding takes place. The lower portion or the guide slot 23 is so designed that during the depression of the key for the digits 1 to 5 the rod 31 is maintained in the position corresponding to positive feeding. If, accidentally, the rod should occupy the position designated by 32, it will be returned to the position corresponding to positive calculation. By means of two arms, the rod 31 is swiugable about a horizontal axle 33 situated adjacent and a short distance in front of the axle 29. The third guide slot 24 (FIGURE 3) serves to star and to stop the machine, and the upper portion of the guide slot has a greater width than the lower and encloses a rod 34, which is displaceable in parallel from the shown position into a position 35, marked by dot and dash lines, to the right of the shown initial position. When the rod 34 moves to the right into the position 35, the machine is started. The lower portion of the guide slot 24 is so formed that the rod 34 is moved from the initial position into the starting position when the key 10 is depressed. The rod 34 is swingable about a horizontal axle 36 situated above the slotted disk 21. The axle 36 is parallel to the abovementioned axles 29 and 33 for the, rod 25 and 31, respectively.

In order to localize the different mechanisms belonging to the multiplying device vertical mounting walls A, B, C and D have been marked in the plan views with dot and dash lines. The walls extend in the longitudinal direction of the machine and are parallel with the right hand side wall of the calculating machine 1.

The rod 25 intended for indicating the digit value is fastened, at one end, in the lever 3% (FIGURE 5), which is forked. One shank 38 of the lever serves as an abutment for a pin 39, whereas the other shank 40 constitutes an attachment for a spring &1 connected to said pin 39. The'lever 30 is swingable about the axle 29 and is shifted directly by means of the guide slot 26 upon the depression of the key it).

Said pin 39 is fixed in a curved lever 42 (FIGURE 5) which is mounted freely on the horizontal axle 29. Thus, the arm 42 is brought to participate in the movement of the forked arm 3% under the influence of the spring 431. In this way, thelever 42 is normally displaced the same angle as the rod 25. The outer part of the lever 42 is provided with a link 43 which, at 44, is articulated to the lever 42.. At its free end, the link 43 is provided with a pin 45 arranged to be inserted in one or the other of five recesses 46, 47 placed in a series, after the lever-42 has been angularly displaced from the shown position intoa certain given position dependent on the value of the depressed key iii. In the normal position, the pin 45 is located immediately before the recess 46 corresponding to the digit 0. Then there follow, in a row upwardly, four recesses 47 separated from each other by means of cog like portions 48. Said recesses thus correspond to the digits 1, 2, 3 and 4, For the digit 5 the pin 45 is inserted at the upper side of the uppermost tooth 48 at a place designated by 49. The cogs 48- form parts of a member 50 which in the following description is termed comb.

As appears from FIGURE 7, the comb 5th constitutes the outer portion of a lever 51 swingably mounted on the axle 29, which lever 51 in the following description is termed registering lever. The tooth-gap like recesses 46, 47, 49 are situated along an arc concentric with the axle 29. In FIGURE 5 the lever 42 is shown, by means of dot and dash lines, in a raised position, in which position the pin 45 is located immediately in front of a recess 47 corresponding to the digit 2. Correspondingly, the rod 25 is shown, by means of dot and dash lines, in a position designated by 53 and corresponding to the same digit. By means of full lines, the rod 25 is shown in the position corresponding to the digit 0. Similarly, the forked lever 38, 4% is shown, by means of dot and dash lines, in a position 54 corresponding to the position 53 of the rod. Further, it appearsfrom FIG- URE 5, that when the rod 25 has been shifted from the zero position to the position corresponding to the digit 2, the lever 42 has been entrained by the spring 41 so that the pin 39'on the last-mentioned lever always rests against the shank 38, which results in the pin 45 being moved upwardly from the shown initial position into the position corresponding to the digit 2.

The introduction of the pin 4-5 into engagement with the comb 50 is effected by the aid of a how 55 (FIG- URES 9, 10), which is swingable about a horizontal axle 56. The bow is formed with a substantially triangular recess 57, both opposite longitudinal edges 58 and 59 of which follow arcs, which have a radius corresponding to the distance from the axle 29. In the shown position, the upper edge 59 of the recess determines the path, along which the pin 4-5 travels upon the movement of the lever 42. The bow 55 is swingable from the shown position in a clockwise direction so that the lower edge 58 of the recess moves into engagement with the pin 25 and pushes this latter into one of the tooth gaps of the comb 5d. As a consequence, the edge 58 of the recess 57 when the pin is in the broken line position of FIGURE 9, will occupy approximately the same position as the edge portion 59.

As shown in FIGURE 7 the comb Ell is joined with a toothed sector 60 having six teeth 61 extending upwardly. The toothed sector 60 is integral with the registering arm 51 and is situated at a shorter radial distance from the axle 29 than the comb 50. The toothed sector and the comb are provided with a corresponding pitchl Moreover the registering arm 51 has a curved recess 62, and one edge portion of which is formed with teeth 63 for the purpose of positioning the arm 51 by the aid of a spring loaded peg 64 cooperating with said tooth series 63. The toothed sector 6 is driven by means of a pin wheel 65 provided with a single tooth 66, which pin wheel is always rotatable in a clockwise direction by means of a motor driven shaft 67. Thus, the pin wheel is arranged to displace the toothed sector on one step upwardly for each complete rotation, whereby the registering arm 51, after having been swung downwards from the shown initial position, may be returned thereto. In FIGURE 7 there is shown, by means of dot and dash lines, a position of the arm 51 resulting from a downward movement corresponding to two pitch steps of the comb 50. Such a movement takes place when the key for the digit 2 is depressed and the driving mechanism is started.

The Driving Arm System The driving mechanism contains a driving arm system, the functions of which will be more closely described in connection with FIGURE 23. Said driving arm system is swingable about its axis to and fro through an angle of about 60. During this stroke of 60, the arm system passes into engagement with a pin 68 provided at the outer part of the same lever 42 (FIGURES 5 and 6) as carries the link 43 with the pin 45. The lever 42, which in this case is coupled to the registering lever 51 by means of the pin 45, is swung downwardly so that a number of teeth 61 of the sector 60 corresponding to the registered digit have moved downwardly past the pin wheel 65. When this wheel is started, the sector 60 with the comb 50 steps back to the shown initial position. The number of revolutions of the pin wheel shaft 67 determines the number of additions or subtractions in the calculating machine 1 in correspondence to the input digit value. In connection with the above it should be stated that the lever 42 may be angularly adjusted in the clockwise direction independently of the lever 39 against the action of the spring 41. This occurs upon the stroke of the driving arm system. On the other hand, the lever 42 is adjusted after the return of the bow 55 to its initial position and hence after the release .of the pin 45 from the comb 50, into the initial position by the aid of the forked arm 30, which last-mentioned arm is guided by the aid of the key and the appertaining slotted guide disk 21.

The rod 34 adjustable by means of the guide slot 24 is swingably mounted on the axle 36 by means of two mutually parallel arms. One of said arms is designated by 69 and, as shown in FIGURE 13, is integral with an arm 70 and an arm 71, which latter arm carries an abutting edge 72 and an angle arm 73 connected to one end of a horizontal rod 74, the other end of which is fixed in a lever mounted on the axle 36. The arm 70' passes obliquely upwards from the mounting axle 36 and is formed, at its end portion, with a nose 75 intended to cooperate with a pin on a circuit closing arm described below in connection with FIGURES 13 and 15.

FIGURES 21 and 22 show an axle clutch of the kind described in my prior Patent No. 2,654,455, dated October 6, 1953. A disk 77 provided with an actuating pin 76 is rotatable about a horizontal axle pin 78. The pin 76 engages with a Z-shaped guide slot 79 in a coupling lever 80 swingable about an axle 81. The guide slot 79 is so formed that upon turning of the lever 80in a counterclockwise direction about the axle 81, the pin 76 moves into engagement with the lower part of the guide slot 79, whereby the disk 77 turns in a counterclockwise direction approximately one eighth revolution. A fixed guide flange 82 and a guide flange 83 provided on the disk 77 are arranged to adjust angularly a rocker arm 84 carried by a rotatable disk 85. The rocker arm 84 is shown in operative position in FIGURE 21. Upon the withdrawal of the guide flange 83, the rocker arm 84 is moved into said operative position from an inoperative position shown in FIGURE 22.

The lever 80 containing the guide slot 79 is actuated by a spring 86, which tends to turn the lever 80 in a counterclockwise direction. A frame wall 87 carries the guide fiange 82 and is formed with a circular opening, in which the disk 85 is rotatable so that the rocker arm is located in its operative position, on the front side of said wall, as shown in FIGURE 21. A branch arm 88 on the coupling lever 80 is directed downwardly, and at its outer end is provided with a stop pin '89 and, at

a certain distance therefrom with an abutting pin 90 (FIGURE 21). The last-mentioned pin is adapted to rest against a cam disk 91, rigidly secured to the disk 85, so that the coupling lever is retained by the cam disk in its inoperative position during the greater part of the revolution of the disk 91. However, during the remaining part of the revolution the coupling lever 80 may, in case the stop pin 89 is freed, be brought into an operative position, i.e. be turned in a counterclockwise direction about its axle 81.

It appears from FIGURE 13 that the stop pin 89 is controlled by a locking lever 92, which is mounted on a shaft 93 and is provided with a branch arm 94 extending downwardly, and actuated by a spring 95, which tends to maintain the locking lever in engagement with the stop pin 89. The locking lever 92 is arranged to be moved into the position, in which the pin 89 will be freed, by the lever 71 connected to the starting rod 34, the abutting edge 72 of said lever 71 connected to the starting rod 34, the abutting edge 72 of said lever 71 passing into engagement with a pin 96 on the branch arm 94 during the travel of the rod 34 to the position of starting.

When the rocker 8-4 is brought into its operative position it will engage a rotatable disk which represents the driven part of the axle clutch as hereinafter will be more fully described.

The keys 10 for the digits 0 to 5 are coupled to their slotted guide disks 21 substantially in the same manner as the key 1 according to FIGURE 3, i.e. the stem of the keys passes into engagement with the lever 19 to the left of the shaft 20 of said lever 19 so that the slotted disk 21 is swung upwards upon the depression of the key. On the other hand, the keys 10 for the digits 6 to 9 are coupled to the slotted guide disks 21' in such a manner that said disk, upon the depression of the key, are swung downwardly about the axle 20. In FIGURE 4, the key 10 for the digit 7 is shown as coupled to its guide disk 21'. By means of vertical slots 12' and 13, the key stem is guided on horizontal rods 14' and 15 in conformity to the key stem 11 for the key 1. A pin 97 is fastened to the key stem and arranged in engagement with a slot 98 in the slotted guide disk and actuated by a spring 99, which tends to move the pin and hence the key and the slotted disk upwardly. The disks 21' are formed with guide slots 22', 23' and 24' corresponding to guide slots 22 to 24 according to FIGURE 3 and so designed that the rods 25, 31 and 34 are moved in the desired manner. Upon the depression of the key, the guide slot 22' displaces the rod 25 a number of steps corresponding to the 9s complementary value of the digit of the key. The guide slot 23' displaces the rod 31 to the negative position, and the guide slot 24' displaces the starting rod 34 to its position of starting upon the depression of the key, in the same manner as the guide slot 24 according to FIG- URE 3.

More particularly, by depressing one of the multiplication keys 10, the machine starts by virtue of the guide slot 24 adjusting the rod 34. At this moment, the shaft 67 starts to rotate in a clockwise direction and thus steps the lever 51 back to zero. When this zero position has been attained, the toothed sector 60 has been moved out of engagement with the tooth 66 on the wheel 65. If the machine still is running, the lever is maintained unactuated in the zero position.

The operating members of the multiplication device are, according to the selected example, driven by a driving arm system 100 actuated by a spring 99, as shown in FIGURE 23, which system by means of a cam disk or guide slot device, is provided with an oscillating stroke motion about its axle 101 through an angle of approximately 60 to and fro. The driving arm system is driven by the aid of the axle clutch 84, described in connection with FIGURES 21 and 22.

The driving arm system according to FIGURES 23 masses and 25 contains four arms, namely. an arm 102 extending upwardly, an arm 103 extending obliquely upwards to the right side, an arm 104 directed obliquely downwards to the right, and an arm 105 directed to the left. This latter arm is arranged to move, in a normal case, i.e. when no additional entry impulse is required, the pin 68 downwardly together with the arms 42 and 51, as stated in connection with FIGURES and 7, so that the comb 50 and the sector 66 are moved downwardly into the initial position of the arm 42.

The lever 102 is provided with a curved arm 1196 ccaxial with the axle 101. vAlso the arm 1% has a similar curved arm 107, which curved arms extend toward each other in a peripherial direction. In the arms 104 and 105 there are two mutually parallel slots constituting guide slots for two pins 109 fixed in a slide 1111 (FIG- URES l9 and 23). Thus, this latter is displaceable in its longitudinal direction on the arm system 100. For the purpose of retaining the slide in one extreme position or the other, which is determined by the length of the slots 108, there is provided in an adjacent frame part of the machine an M-shaped recess consisting of two arcformed guide slots 111 and 112 coaxial with the axle 1011, said guide slots being at the lower ends joined to each. other in such a manner that a guide pin 113 fastened to the slide is freely displaceable in the recess throughout the length of stroke of the slide 110. The curved guide slots 1'11 and 112 are located at a radial distance from each other corresponding to the length of stroke of the slide so that through the displacement of the slide the guide pin 113 may be set either under the mouth of the slot 111 or under the mouth of the slot 112, which last-mentioned position is shown in the FIGURE 23. The slide 110 serves to carry out an additional entry impulse in the machine, and for this purpose the slide 110= must be displaced from the right extreme position shown to the left extreme position marked by means of dot and dash lines (FIGURE 19). This displacement is effected by the aidof an arm 116, which is adapted to engage a pin 117 disposed on the slide a small distance above the guide pin 113 and directed in a direction opposite to this pin. The arm 116 is turned in a clockwise direction about an axle 118 under the action of a spring 119 inter posed between the arm and a fixed pin 120. As shown in FIGURE 19 the arm 116 is locked by a pawl 121 swingable about a pin 122. Said pawl cooperates with a pin 123 on the lower part of the arm 116. The pawl 121 is actuated by a spring 124, which tends to turn the pawl member into engagement with the pin 123. Thus, by turning the pawl 121 out of engagement, the arm 116 is freed, whereby the arm exerts a pressure on the pin 117 under the influence of the spring 11% so that the slide is displaced from the shown position into its left extreme position intended for the entry of the multiplicand additionally into the totalizer of the adding machine.

The adjustment of the pawl 121 to freeing position takes place by the aid of an arm 125 appertaining to an arm system 126, shown in FIGURES 24 and 25, which is freely mounted on the axle 10-1. The movement of the arm system 126 will be more specifically described in connection with FIGURE 24. The left end portion 114- of the slide 11% occupies, in the operative position of the slide, such a position in relation to the arm 105 that the pin 68 on the arm 42 is brought downwards upon the stroke motion of the driving arm system one pitch step below the zero position corresponding to the pitch of the comb 51), whereby the pin wheel 67 must perform an additional rotation in relation to the digit value registered by the arm 51, and the multiplicand is entered a further time into the totalizer. As a rule, it may be stated that the slide 110 is displaced into operative position every time a change of sign, plus or minus, takes place for the calculating operation.

The arm 116 shifting the slide is provided with a pin 127, on which an arm 128 is swingably mounted. The two arms 116 and 128 are interconnected by means of a spring 129 in such a manner that the arm 128 is moved in a counterclockwise direction when the arm 116 is turned in the same direction. As a result, the arm 128 passes into engagement with the pin 117 on the slide and brings this latter part to the initial position.

The change of sign in the calculating operation is indicated, as mentioned above, by the rod 31 when this later part is displaced from the positive to the negative position, or vice versa. The mechanism for obtaining the additional entry is described below with reference to FIGURES 17 and 18. By means of mutually parallel arms the rod 31 is swingable about the axle 33. One of these arms is shown in the drawing and is designatedby 131 The arm 1319 is shown in full lines in the position corresponding to positive setting-up. A spring 131 tends to turn the arm in a counterclockwise direction. At the upper part of the arm there are provided two pins 132 and 133 constituting supporting pins for each of the shanks 134 and 135, respectively, of a spring 136 so bent as to have the shape of a hair pin, and with said spring grasping, by means of an eye 137, a pin 138 on the arm 13th. The two spring shanks 134, extend upwardly beyond the arm 130 and each rest against corresponding pin 139 and 140, respectively, on a branch arm 141 appertaining to an arm 142 likewise swingable about the axle 33, The branch arm 141 constitutes substantially a bow concentric with said axle 33. From the upper part of the arm 13% there extends an angle lever 143, which is provided with a pin 144 arranged in engagement with a slot 145 in a lever 14-6. This latter is swingable about anaxle 147. The lower part of the lever 146 is curved and arranged to cooperate with a rocking lever 148, which last-mentioned lever is swingable about a pin 149 and is actuated by a spring 1511 which tends to turn the rocking lever in a clockwise direction. The rocking lever is provided with a pin 151, with which the lever 1% passes into engagement for the purpose of angularly adjusting the rocking lever against the action of the spring 159 into a position shown by means of dot and dash lines. This takes place when the rod 31 is displaced from the positive to the negative position, i.e. from the left position shown to the position marked by 32 in FIGURE 3. During said adjustment, the movement is transmitted by means of the arm 130, 143 to the lever 146, which in turn adjusts the rocking lever in the manner stated above.

As shown in FIGURES 26 and 27, the rocking lever is mounted at one end of a lever 152, which is swingable about an axle 153 and the other end of which is formed with a slot 154 enclosing a pin 155. The lever 152 is turnable in a clockwise direction, and hence the rocking lever 143 will occupy a position above a pin 156 on the arm 142 (FIGURE 17). Thus, the rocking lever 1418 is retained in its angular position relatively to the lever 152 by the aid of the spring 15%, one end of which is connected to the rocking lever, and its other end being united with the lever 152. However, when the arm 152 is moved downwardly back to the position shown by means of full lines, the outer edge portion 157 of the rocking lever passes into engagement with the pin 156, provided said pin is situated in the path of the rocking lever upon the downward movement of the lever 152..

The arms 130 and 142 (FIGURE 17) coupled together by means of the hair-pin spring 136 are included in the mechanism which impulses the additional entry of the adding machine. An angle lever 153 connected to the arm 142 is provided, at its outer end, with a pin 159 intended to pass into engagement with either of two abutting edges 166 and 161 on the lower part of an upstanding arm portion 162 appertaining to the arm system 126 mounted on the axle 101 (FIGURE 24). The arm 162 is provided, at its upper end, with a pin 163 intended to cooperate with a pawl 164 swingable about a pin 165 and actuated by a spring 166, which latter spring 

